What occurred while the lunar surface was melted by radioactive heat?

A) lava flows formed maria.

B) earth and a planetesimal collided.

C) the moon became geologically inactive.

D) bombardment by meteoroids formed the highlands.

What does a gamma ray primarily consist of?

How are acids and bases different? how do their pH values differ?

Which of the following types of volcanoes has steep sides with a broad, gently sloping base?

How could differences in beak size lead to reproductive isolation?

Living systems must maintain their chemical and physical organizations in order to prevent death. how do living organisms maintain the organization of their internal systems?

If an ambulance hits someone on the road while transporting someone to a hospital, do they bring that person with them too?

Cell biologists have introduced radioactively labeled carbohydrates, fats, and amino acids to living cells, allowed time for cell metabolism, and then placed the cells in a blender and separated out the various cell organelles from the cytoplasm.

Increased production of goods makes our lives more comfortable, but causes an increase in the demand for energy and other resources. One negative impact of this situation on ecosystems is an increase in

One of the most common causes of pneumonia is Streptococcus pneumoniae, a gram-positive bacterium. Surrounding the bacterium is a thick structural component layer known as a capsule.

What determines which of the two dna strands will serve as the template during transcription?